| 講演抄録／キーワード |
| 講演名 |
2018-11-28 16:30
［ポスター講演］[Poster Presentation] A Current-Mode Differential Sensing CMOS Imager for Optical Linear Encoder
○You-Shin Chen・Tzu-Hsiang Hsu（NTHU）・Chien-Wen Chen（ITRI）・Chih-Cheng Hsieh（NTHU） |
| 抄録 |
（和） |
This paper presents a high speed low noise CMOS imager for optical linear encoder. Dual sensor arrays and the corresponding readout circuit are implemented for incremental and absolute signals, respectively. For incremental signal, current-mode differential sensing (CMDS) frontend with buffered direct injection (BDI) is proposed for DC background cancellation and high response bandwidth. Transimpedance amplifier (TIA) is implemented for current-to-voltage conversion with low-pass filtering function for noise reduction. Programmable amplifier (PGA) is implemented for single-to-differential conversion and full-range fitting for the following 12-bit SAR analog-to-digital converter (ADC). For absolute signal, 42 sensor pixels with the corresponding dual-threshold quantizer and latch are implemented. This work achieves a SNR of 63.4dB, a phase error of 33.8 degree at 3.3MHz incremental input, and an ADC ENOB of 11.08-bit at a sampling rate of 200kHz. |
| （英） |
This paper presents a high speed low noise CMOS imager for optical linear encoder. Dual sensor arrays and the corresponding readout circuit are implemented for incremental and absolute signals, respectively. For incremental signal, current-mode differential sensing (CMDS) frontend with buffered direct injection (BDI) is proposed for DC background cancellation and high response bandwidth. Transimpedance amplifier (TIA) is implemented for current-to-voltage conversion with low-pass filtering function for noise reduction. Programmable amplifier (PGA) is implemented for single-to-differential conversion and full-range fitting for the following 12-bit SAR analog-to-digital converter (ADC). For absolute signal, 42 sensor pixels with the corresponding dual-threshold quantizer and latch are implemented. This work achieves a SNR of 63.4dB, a phase error of 33.8 degree at 3.3MHz incremental input, and an ADC ENOB of 11.08-bit at a sampling rate of 200kHz. |
| キーワード |
（和） |
Optical encoder / transimpedance amplifier / position detection / / / / / |
| （英） |
Optical encoder / transimpedance amplifier / position detection / / / / / |
| 文献情報 |
映情学技報, vol. 42, no. 40, IST2018-80, pp. 43-44, 2018年11月. |
| 資料番号 |
IST2018-80 |
| 発行日 |
2018-11-21 (IST) |
| ISSN |
Print edition: ISSN 1342-6893 Online edition: ISSN 2424-1970 |
| PDFダウンロード |
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